All-Wheel Drive
When to Check Lubricant
It is not necessary to regularly check fluid unless you suspect there is a leak or you hear an unusual noise. A fluid loss could indicate a problem. Have it inspected and repaired.
How to Check Lubricant

To get an accurate reading, the vehicle should be on a level surface.
If the level is below the bottom of the filler plug hole, located on the transfer case, you’ll need to add some lubricant. Add enough lubricant to raise the level to the bottom of the filler plug hole.
Use care not to overtighten the plug.
What to Use
To determine what kind of lubricant to use.
See also:
OnStar®
OnStar® uses several innovative technologies and live
advisors to provide a wide range of safety, security,
navigation, diagnostics, and calling services. ...
USB Port
For vehicles with a USB port, the following devices may be connected and controlled by the infotainment system:
► iPods
► PlaysForSure Devices (PFD)
► USB Drives
► Zunes ...
Collision Damage Repair
If your vehicle is involved in a collision and it is
damaged, have the damage repaired by a qualified
technician using the proper equipment and
quality replacement parts. Poorly performed
collisio ...
